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Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...
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Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
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Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications
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Tunable PEG-Azlactone Hydrogels Enable Programmable Multiphase Drug Delivery.

Emily Rasmussen1, S K Arif Mohammad1, Kendall Kelly1

  • 1Department of Biomedical Engineering, University of Mississippi, University, Mississippi 38677, United States.

Biomacromolecules
|May 14, 2026
PubMed
Summary
This summary is machine-generated.

New hydrogels made from azlactone-functional polymers and poly(ethylene glycol) (PEG) offer precise control over drug release. Researchers tuned hydrogel properties to achieve phased delivery of multiple therapeutic agents from a single formulation.

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Published on: October 29, 2013

Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery

Background:

  • Advanced therapeutic strategies require biomaterials for controlled, time-dependent release of multiple agents.
  • Existing materials face challenges in precisely regulating complex release profiles.

Purpose of the Study:

  • To develop and evaluate a tunable hydrogel platform for programmable, phased delivery of diverse therapeutic cargos.
  • To investigate how hydrogel composition influences network characteristics, degradation, and release kinetics.

Main Methods:

  • Azlactone-functional polymers were cross-linked with poly(ethylene glycol) (PEG) to create hydrogels.
  • Varied cross-linking density and PEG-diol to PEG-diamine ratio (PEG-OH:PEG-NH) to tune network properties.
  • Assessed hydrogel degradation and release kinetics of small molecules, proteins, and nanoparticles.

Main Results:

  • Hydrogel composition significantly impacted network stability, hydrolytic degradation, and mesh size.
  • Increased PEG-OH:PEG-NH ratio accelerated degradation; decreased cross-linking density expanded the mesh.
  • Achieved programmable, phased release of multiple cargos (small molecules and antibodies) from the same hydrogel.

Conclusions:

  • PEG-azlactone hydrogels provide a tunable platform for precise control over drug release kinetics.
  • The platform enables programmable, phased delivery of structurally diverse therapeutic agents.
  • These hydrogels show promise for advanced combination therapies and complex drug delivery regimens.